长线高功率同轴电缆组件主要应用于发射机和天线距离较远的系统,其敷设环境和高功率使用环境使其频繁处于热胀冷缩的状态,内导体由于受约束,会承受较大的内应力作用。由于内导体为整体,且束缚力较小,内应力会在内导体强度相对薄弱的位置积聚,促使该位置首先产生疲劳效应并最终发生故障,影响系统使用。文中就长线高功率同轴电缆组件长期工作后的失效进行分析,对长线高功率同轴电缆组件的使用寿命进行了理论分析及软件仿真,并通过试验验证了电缆组件内导体从出现开裂到发生故障所能承受的内应力冲击的极限次数,给出了不同长度高功率同轴电缆组件在不同加载功率下的寿命评估以及在寿命周期内的维护保障建议。

Long-line high-power coaxial cable assemblies are mainly used in systems with long distances between transmitters and antennas. Their laying environments and high-power usage environments frequently make them to be in the state of thermal expansions and contractions. Because the inner conductor is restrained, it will withstand significant internal stress of cross section. Due to the integrity of the inner conductor and its low binding force, the internal stress will accumulate in the position where the inner conductor strength is relatively weak, causing fatigue effects to occur first and ultimately leading to failure, which affects the use of the system. In this paper the failure of long-line high-power coaxial cable assemblies after long-term operation is analyzed, and theoretical analysis and software simulation are conducted on the service life of long-line high-power coaxial cable assemblies. The ultimate number of internal stress impacts that the conductor inside the cable assemblies can withstand from cracking to failure has been verified through experiments. Life evaluations of high-power coaxial cable assemblies of different lengths under different loading powers and suggestions of maintenance during the life cycle are provided.

TM75